forked from OSchip/llvm-project
315 lines
10 KiB
C++
315 lines
10 KiB
C++
//===-- X86ATTInstPrinter.cpp - AT&T assembly instruction printing --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file includes code for rendering MCInst instances as AT&T-style
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// assembly.
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//
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//===----------------------------------------------------------------------===//
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#include "X86ATTInstPrinter.h"
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#include "MCTargetDesc/X86BaseInfo.h"
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#include "X86InstComments.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCInstrDesc.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/Support/Casting.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cassert>
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#include <cinttypes>
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#include <cstdint>
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using namespace llvm;
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#define DEBUG_TYPE "asm-printer"
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// Include the auto-generated portion of the assembly writer.
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#define PRINT_ALIAS_INSTR
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#include "X86GenAsmWriter.inc"
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void X86ATTInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
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OS << markup("<reg:") << '%' << getRegisterName(RegNo) << markup(">");
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}
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void X86ATTInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
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StringRef Annot, const MCSubtargetInfo &STI) {
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const MCInstrDesc &Desc = MII.get(MI->getOpcode());
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uint64_t TSFlags = Desc.TSFlags;
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// If verbose assembly is enabled, we can print some informative comments.
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if (CommentStream)
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HasCustomInstComment =
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EmitAnyX86InstComments(MI, *CommentStream, getRegisterName);
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if (TSFlags & X86II::LOCK)
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OS << "\tlock\t";
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// Output CALLpcrel32 as "callq" in 64-bit mode.
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// In Intel annotation it's always emitted as "call".
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//
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// TODO: Probably this hack should be redesigned via InstAlias in
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// InstrInfo.td as soon as Requires clause is supported properly
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// for InstAlias.
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if (MI->getOpcode() == X86::CALLpcrel32 &&
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(STI.getFeatureBits()[X86::Mode64Bit])) {
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OS << "\tcallq\t";
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printPCRelImm(MI, 0, OS);
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}
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// data16 and data32 both have the same encoding of 0x66. While data32 is
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// valid only in 16 bit systems, data16 is valid in the rest.
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// There seems to be some lack of support of the Requires clause that causes
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// 0x66 to be interpreted as "data16" by the asm printer.
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// Thus we add an adjustment here in order to print the "right" instruction.
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else if (MI->getOpcode() == X86::DATA16_PREFIX &&
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(STI.getFeatureBits()[X86::Mode16Bit])) {
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MCInst Data32MI(*MI);
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Data32MI.setOpcode(X86::DATA32_PREFIX);
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printInstruction(&Data32MI, OS);
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}
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// Try to print any aliases first.
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else if (!printAliasInstr(MI, OS))
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printInstruction(MI, OS);
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// Next always print the annotation.
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printAnnotation(OS, Annot);
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}
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void X86ATTInstPrinter::printSSEAVXCC(const MCInst *MI, unsigned Op,
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raw_ostream &O) {
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int64_t Imm = MI->getOperand(Op).getImm();
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switch (Imm) {
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default: llvm_unreachable("Invalid ssecc/avxcc argument!");
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case 0: O << "eq"; break;
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case 1: O << "lt"; break;
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case 2: O << "le"; break;
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case 3: O << "unord"; break;
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case 4: O << "neq"; break;
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case 5: O << "nlt"; break;
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case 6: O << "nle"; break;
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case 7: O << "ord"; break;
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case 8: O << "eq_uq"; break;
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case 9: O << "nge"; break;
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case 0xa: O << "ngt"; break;
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case 0xb: O << "false"; break;
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case 0xc: O << "neq_oq"; break;
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case 0xd: O << "ge"; break;
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case 0xe: O << "gt"; break;
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case 0xf: O << "true"; break;
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case 0x10: O << "eq_os"; break;
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case 0x11: O << "lt_oq"; break;
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case 0x12: O << "le_oq"; break;
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case 0x13: O << "unord_s"; break;
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case 0x14: O << "neq_us"; break;
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case 0x15: O << "nlt_uq"; break;
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case 0x16: O << "nle_uq"; break;
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case 0x17: O << "ord_s"; break;
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case 0x18: O << "eq_us"; break;
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case 0x19: O << "nge_uq"; break;
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case 0x1a: O << "ngt_uq"; break;
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case 0x1b: O << "false_os"; break;
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case 0x1c: O << "neq_os"; break;
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case 0x1d: O << "ge_oq"; break;
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case 0x1e: O << "gt_oq"; break;
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case 0x1f: O << "true_us"; break;
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}
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}
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void X86ATTInstPrinter::printXOPCC(const MCInst *MI, unsigned Op,
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raw_ostream &O) {
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int64_t Imm = MI->getOperand(Op).getImm();
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switch (Imm) {
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default: llvm_unreachable("Invalid xopcc argument!");
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case 0: O << "lt"; break;
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case 1: O << "le"; break;
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case 2: O << "gt"; break;
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case 3: O << "ge"; break;
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case 4: O << "eq"; break;
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case 5: O << "neq"; break;
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case 6: O << "false"; break;
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case 7: O << "true"; break;
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}
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}
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void X86ATTInstPrinter::printRoundingControl(const MCInst *MI, unsigned Op,
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raw_ostream &O) {
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int64_t Imm = MI->getOperand(Op).getImm() & 0x3;
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switch (Imm) {
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case 0: O << "{rn-sae}"; break;
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case 1: O << "{rd-sae}"; break;
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case 2: O << "{ru-sae}"; break;
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case 3: O << "{rz-sae}"; break;
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}
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}
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/// printPCRelImm - This is used to print an immediate value that ends up
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/// being encoded as a pc-relative value (e.g. for jumps and calls). These
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/// print slightly differently than normal immediates. For example, a $ is not
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/// emitted.
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void X86ATTInstPrinter::printPCRelImm(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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const MCOperand &Op = MI->getOperand(OpNo);
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if (Op.isImm())
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O << formatImm(Op.getImm());
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else {
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assert(Op.isExpr() && "unknown pcrel immediate operand");
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// If a symbolic branch target was added as a constant expression then print
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// that address in hex.
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const MCConstantExpr *BranchTarget = dyn_cast<MCConstantExpr>(Op.getExpr());
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int64_t Address;
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if (BranchTarget && BranchTarget->evaluateAsAbsolute(Address)) {
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O << formatHex((uint64_t)Address);
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} else {
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// Otherwise, just print the expression.
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Op.getExpr()->print(O, &MAI);
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}
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}
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}
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void X86ATTInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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const MCOperand &Op = MI->getOperand(OpNo);
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if (Op.isReg()) {
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printRegName(O, Op.getReg());
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} else if (Op.isImm()) {
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// Print immediates as signed values.
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int64_t Imm = Op.getImm();
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O << markup("<imm:") << '$' << formatImm(Imm) << markup(">");
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// TODO: This should be in a helper function in the base class, so it can
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// be used by other printers.
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// If there are no instruction-specific comments, add a comment clarifying
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// the hex value of the immediate operand when it isn't in the range
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// [-256,255].
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if (CommentStream && !HasCustomInstComment && (Imm > 255 || Imm < -256)) {
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// Don't print unnecessary hex sign bits.
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if (Imm == (int16_t)(Imm))
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*CommentStream << format("imm = 0x%" PRIX16 "\n", (uint16_t)Imm);
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else if (Imm == (int32_t)(Imm))
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*CommentStream << format("imm = 0x%" PRIX32 "\n", (uint32_t)Imm);
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else
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*CommentStream << format("imm = 0x%" PRIX64 "\n", (uint64_t)Imm);
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}
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} else {
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assert(Op.isExpr() && "unknown operand kind in printOperand");
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O << markup("<imm:") << '$';
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Op.getExpr()->print(O, &MAI);
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O << markup(">");
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}
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}
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void X86ATTInstPrinter::printMemReference(const MCInst *MI, unsigned Op,
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raw_ostream &O) {
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const MCOperand &BaseReg = MI->getOperand(Op + X86::AddrBaseReg);
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const MCOperand &IndexReg = MI->getOperand(Op + X86::AddrIndexReg);
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const MCOperand &DispSpec = MI->getOperand(Op + X86::AddrDisp);
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const MCOperand &SegReg = MI->getOperand(Op + X86::AddrSegmentReg);
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O << markup("<mem:");
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// If this has a segment register, print it.
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if (SegReg.getReg()) {
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printOperand(MI, Op + X86::AddrSegmentReg, O);
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O << ':';
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}
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if (DispSpec.isImm()) {
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int64_t DispVal = DispSpec.getImm();
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if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
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O << formatImm(DispVal);
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} else {
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assert(DispSpec.isExpr() && "non-immediate displacement for LEA?");
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DispSpec.getExpr()->print(O, &MAI);
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}
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if (IndexReg.getReg() || BaseReg.getReg()) {
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O << '(';
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if (BaseReg.getReg())
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printOperand(MI, Op + X86::AddrBaseReg, O);
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if (IndexReg.getReg()) {
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O << ',';
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printOperand(MI, Op + X86::AddrIndexReg, O);
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unsigned ScaleVal = MI->getOperand(Op + X86::AddrScaleAmt).getImm();
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if (ScaleVal != 1) {
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O << ',' << markup("<imm:") << ScaleVal // never printed in hex.
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<< markup(">");
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}
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}
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O << ')';
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}
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O << markup(">");
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}
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void X86ATTInstPrinter::printSrcIdx(const MCInst *MI, unsigned Op,
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raw_ostream &O) {
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const MCOperand &SegReg = MI->getOperand(Op + 1);
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O << markup("<mem:");
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// If this has a segment register, print it.
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if (SegReg.getReg()) {
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printOperand(MI, Op + 1, O);
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O << ':';
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}
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O << "(";
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printOperand(MI, Op, O);
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O << ")";
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O << markup(">");
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}
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void X86ATTInstPrinter::printDstIdx(const MCInst *MI, unsigned Op,
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raw_ostream &O) {
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O << markup("<mem:");
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O << "%es:(";
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printOperand(MI, Op, O);
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O << ")";
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O << markup(">");
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}
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void X86ATTInstPrinter::printMemOffset(const MCInst *MI, unsigned Op,
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raw_ostream &O) {
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const MCOperand &DispSpec = MI->getOperand(Op);
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const MCOperand &SegReg = MI->getOperand(Op + 1);
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O << markup("<mem:");
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// If this has a segment register, print it.
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if (SegReg.getReg()) {
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printOperand(MI, Op + 1, O);
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O << ':';
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}
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if (DispSpec.isImm()) {
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O << formatImm(DispSpec.getImm());
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} else {
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assert(DispSpec.isExpr() && "non-immediate displacement?");
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DispSpec.getExpr()->print(O, &MAI);
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}
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O << markup(">");
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}
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void X86ATTInstPrinter::printU8Imm(const MCInst *MI, unsigned Op,
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raw_ostream &O) {
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if (MI->getOperand(Op).isExpr())
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return printOperand(MI, Op, O);
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O << markup("<imm:") << '$' << formatImm(MI->getOperand(Op).getImm() & 0xff)
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<< markup(">");
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}
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